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From: Petr Tesarik <ptesarik@suse.cz>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: catalin.marinas@arm.com, linux-mm@kvack.org,
	linux-riscv@lists.infradead.org, frowand.list@gmail.com,
	Christoph Hellwig <hch@lst.de>,
	linux-arch@vger.kernel.org, f.fainelli@gmail.com,
	will@kernel.org, devicetree@vger.kernel.org,
	marc.zyngier@arm.com, robh+dt@kernel.org,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, phill@raspberryi.org,
	mbrugger@suse.com, eric@anholt.net, linux-kernel@vger.kernel.org,
	iommu@lists.linux-foundation.org, wahrenst@gmx.net,
	akpm@linux-foundation.org, Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v2 10/11] arm64: edit zone_dma_bits to fine tune dma-direct min mask
Date: Tue, 27 Aug 2019 09:03:41 +0200
Message-ID: <20190827090341.2bf6b336@ezekiel.suse.cz> (raw)
In-Reply-To: <4d8d18af22d6dcd122bc9b4d9c2bd49e8443c746.camel@suse.de>

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On Mon, 26 Aug 2019 13:08:50 +0200
Nicolas Saenz Julienne <nsaenzjulienne@suse.de> wrote:

> On Mon, 2019-08-26 at 09:06 +0200, Christoph Hellwig wrote:
> > On Tue, Aug 20, 2019 at 04:58:18PM +0200, Nicolas Saenz Julienne wrote:  
> > > -	if (IS_ENABLED(CONFIG_ZONE_DMA))
> > > +	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
> > >  		arm64_dma_phys_limit = max_zone_dma_phys();
> > > +		zone_dma_bits = ilog2((arm64_dma_phys_limit - 1) &
> > > GENMASK_ULL(31, 0)) + 1;  
> >  
> Hi Christoph,
> thanks for the rewiews.
> 
> > This adds a way too long line.  
> 
> I know, I couldn't find a way to split the operation without making it even
> harder to read. I'll find a solution.

If all else fails, move the code to an inline function and call it e.g.
phys_limit_to_dma_bits().

Just my two cents,
Petr T

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Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 14:58 [PATCH v2 00/11] Raspberry Pi 4 DMA addressing support Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 01/11] asm-generic: add dma_zone_size Nicolas Saenz Julienne
2019-08-26  7:09   ` Christoph Hellwig
2019-08-26 13:46     ` Nicolas Saenz Julienne
2019-08-28  9:44       ` Nicolas Saenz Julienne
2019-08-30 14:45       ` Catalin Marinas
2019-08-30 17:24         ` Nicolas Saenz Julienne
2019-09-02 13:01           ` Christoph Hellwig
2019-08-20 14:58 ` [PATCH v2 02/11] arm: use generic dma_zone_size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 03/11] of/fdt: add of_fdt_machine_is_compatible function Nicolas Saenz Julienne
2019-08-20 17:16   ` Rob Herring
2019-08-20 17:27     ` Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size() Nicolas Saenz Julienne
2019-08-20 17:14   ` Rob Herring
2019-08-20 14:58 ` [PATCH v2 05/11] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 06/11] arm64: rename variables used to calculate ZONE_DMA32's size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 07/11] arm64: re-introduce max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 08/11] arm64: use both ZONE_DMA and ZONE_DMA32 Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 09/11] dma-direct: turn ARCH_ZONE_DMA_BITS into a variable Nicolas Saenz Julienne
2019-08-26  7:05   ` Christoph Hellwig
2019-08-26 11:33   ` Michael Ellerman
2019-08-20 14:58 ` [PATCH v2 10/11] arm64: edit zone_dma_bits to fine tune dma-direct min mask Nicolas Saenz Julienne
2019-08-26  7:06   ` Christoph Hellwig
2019-08-26 11:08     ` Nicolas Saenz Julienne
2019-08-27  7:03       ` Petr Tesarik [this message]
2019-08-20 14:58 ` [PATCH v2 11/11] mm: refresh ZONE_DMA and ZONE_DMA32 comments in 'enum zone_type' Nicolas Saenz Julienne
2019-08-26  7:07   ` Christoph Hellwig

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